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  • Title: Effects of polyethylene IUDs and unilateral ovariectomy in golden hamsters.
    Author: Hodosh RJ, Magalhaes H.
    Journal: J Reprod Fertil; 1977 Jul; 50(2):311-3. PubMed ID: 881671.
    Abstract:
    The effect of unilateral ovariectomy and ployethylene IUDs was studied in golden hamsters 2.5-8.5 months of age of proven fertility. After anesthesia by ip injection of sodium pentobarbitol (Diabutal), 1 of 6 different operative procedures was performed unilaterally on 1 ovary or horn per animal, leaving the contralateral horn for comparison. The 6 groups were 1) insertion of an IUD, 2) ovariectomy, 3) IUD + ovariectomy, 4) sham IUD, 5) sham ovariectomy, and 6) sham IUD + ovariectomy. There were 10 females in each group, they were paired 1 week after the operation and sacrificed 2 weeks after mating. Implantations in each uterus were counted and sizes estimated. Embryos were considered living by heartbeat or muscle movement. Total numbers of implantations and live embryos were compared by 2-way analysis of variance with Tukey's method for multiple comparisons. The presence of an IUD or removal of ovary completely blocked pregnancy in the uterine horn on that side. The 3 sources of variance all contributed significantly to the total nubmer of implantations for the 6 groups. The values for the live embryos were also significant for the groups. There were no significant differences with respect to the sizes of implantations and live embryos. In Group 3, the numbers of implantations in the contralateral horn were equivalent to those in Group 2, suggesting that the IUD did not counteract the compensatory ovulation caused by the unilateral ovariectomy, nor result in increased numbers of live young.
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